Question

by measuring oxygen production with aerobic bacteria, engelmann described an action spectrum for photosynthesis. the action spectrum (indicated by the black - line plot in the image above) shows the relative effectiveness of each color of light in driving photosynthesis. what assumptions did engelmann make in order to conclude that red and violet - blue light were more effective than green light in driving photosynthesis? select the two that apply. view available hint(s) the algae absorbed the same number of photons at each wavelength (color). every photon absorbed by the algae was used to drive oxygen production by the algae. the distribution of chloroplasts within each algal cell was approximately the same. the number of bacteria clustered at each wavelength (color) was approximately proportional to the amount of oxygen being produced by that portion of the algae. one of your answers is incorrect. keep in mind that photons can be absorbed by pigments other than those that function in photosynthesis. no credit lost. try again. previous answers submit

Explanation:

Engelmann's experiment on photosynthesis action spectrum assumed that the amount of oxygen produced was related to photosynthetic effectiveness. He used aerobic bacteria to indicate oxygen - rich areas. The assumptions were that the distribution of chloroplasts within each algal cell was approximately the same to ensure consistent photosynthetic potential per cell and that the number of bacteria clustered at each wavelength was proportional to the oxygen produced at that wavelength, which reflected photosynthetic efficiency at different wavelengths.

Answer:

The distribution of chloroplasts within each algal cell was approximately the same.
The number of bacteria clustered at each wavelength (color) was approximately proportional to the amount of oxygen being produced by that portion of the alga.